The invention provides a method and device for processing expansion engineering data of power supply enterprises. The method comprises the steps of receiving the expansion engineering data of the power supply enterprises, input by a first user; preliminarily reviewing the expansion engineering data of the power supply enterprises, input by the first user; when the preliminary review is not passed, ending the processing of the expansion engineering data of the power supply enterprises; when the preliminary review is passed, creating a task of processing the expansion engineering data of the power supply enterprises; selecting a corresponding second user to process the expansion engineering data of the power supply enterprises according to the task of processing the expansion engineering data of the power supply enterprises; receiving the results of processing the expansion engineering data of the power supply enterprises, input by the corresponding second user; and summarizing the processing results input by the corresponding second user and sending the summarized processing results to the first user. By using the method and device for processing the expansion engineering data of the power supply enterprises, the processing of the expansion engineering data of the power supply enterprises is not completely dependent on manual work; the review period is shortened; and lots of paper materials are not needed to be printed and paper waste is avoided.